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OCCURRENCE of the BEET LEAFHOPPER and Assocfat©©— INSECTS on SECONDAÍLY P1,^^T SUCCESSIONS in Sqjljtj|Ffli^38 Ú IDAHO Ü

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OCCURRENCE of the BEET LEAFHOPPER and Assocfat©©— INSECTS on SECONDAÍLY P1,^^T SUCCESSIONS in Sqjljtj|Ffli^38 Ú IDAHO Ü TECHNICAL BULLETIN NO. 607 MAY 1938 Cop« 3 OCCURRENCE OF THE BEET LEAFHOPPER AND ASSOCfAT©©— INSECTS ON SECONDAÍLY P1,^^T SUCCESSIONS IN SQjLJTj|fflI^38 ú IDAHO Ü. S. Departîiit^it cf Agriculture I BY D. E. FOX Junior Entomologist Division of Truck Crop and Garden Insect Investigations Bureau of Entomology and Plant Quarantine UNITED STATES DEPARTMENT OF AGRICULTURE, WASHINGTON, D. C. For sale by the Superintendent of Documents, Washington, D. G Price 10 cents Techninal Bulletin No. 607 May 1938 UNITED STATES DEPARTMENT OF AGRICULTURE WASHINGTON, D. C. OCCURRENCE OF THE BEET LEAFHOPPER AND ASSOCIATED INSECTS ON SECONDARY PLANT SUCCESSIONS IN SOUTHERN IDAHO ^ By D. E. Fox, junior entomologist y Division of Truck Crop and Garden Insect Investigations^ Bureau of Entomology and Plant Quarantine ^ CONTENTS Page Page Introduction- 1 Weeds abundant on abandoned land and their Cultural history of the area 2 importance as host plants of predominating insect species.__ 12 History of the plots 3 Spring host plants (tumblemustard and Methods of sampling and limitations of the flixweed) 12 study 5 Summer and fall host plant (Russian- thistle) 13 The predominating insect species encountered Fluctuations in beet leafhopper populations during the study 6 following changes in plant cover 16 The beet leafhopper __ 7 Plant-cover changes and beet leafhopper populations in plot4 _ ._ 17 The alfalfa leafhopper 8 Plant-cover changes and beet leafhopper The mustard leafhopper 9 populations intheHollisterarea. _ 21 The big-eyed bug— 9 Successive populations of predominating in- The mottled plant bug 10 sects found on plot 4__ 23 Other insects found on annual weeds of plot 4 _. 32 The pale legume bug 10 Comparison of insect fauna of sagebrush with The false chinch bug 10 that of annual weeds of abandoned land 36 A damsel bug 11 Summary and conclusions 42 The mustard flea beetle 11 Literature cited 43 INTRODUCTION In a study of the beet leafhopper (Eutettix tenellus (Baker)) and its relationship to the insect populations of the secondary plant succes- sions of the sagebrush association in southern Idaho, the most impor- tant fact revealed, from an economic standpoint, is that this insect is significantly abundant upon the plants of the earlier weed growth but is either lacking or constitutes an insignificant part of the insect fauna of both the later successions and the original sagebrush association. The study of the beet leafhopper, the insect vector of curly top, which is an important virus disease of sugar beets, tomatoes, and other cultivated crops in the Western States, was first undertaken as a formal project by the Bureau of Entomology in 1925. Twin Falls, 1 Received for publication April 26,1937. 2 In the accumulation of the necessary data many individuals eventually became more or less intimately associated with this work. The study was conceived and the project inaugurated in 1928 by Walter Carter, then of the Bureau of Entomology, and was carried out under his direction from 1928 to 1929. The work was under the direction of P. N. Annand from 1930 to 1931, and under J. C. Chamberlin from 1932until its termination in 1933. With the cooperation of the Bureau of Plant Industry a study of the plant successions was begun in the spring of 1928 by R. L. Piemeisel. All of the plant-succession data used in this bulletin were collected and treated by Piemeisel, who also gave valuable criticisms and suggestions while the manu- script was in the course of preparation. Acknowledgements are also due to C. T. McCoy and J. A. Gillett, who did most of the sorting of collections and pinning of specimens during 1929,1930, and 1931, and to W. O. Cook, who gave valuable criticisms of the manuscript. 25203°—38 1 1 2 TECHNICAL BULLETIN 6 0 7, U. S. DEPT. OF AGRICULTURE Idaho, was selected as the headquarters for the study because of the periodic economic damage which occurred in that locality and because it is in an important permanent breeding area. Carter (^),^ early in his investigation of the problem in southern Idaho, pointed out that the weeds covermg the abandoned land served as important breeding hosts for the beet leafhopper. It was therefore determined to make a study of the particular relationship that existed between the succession of the various secondary plants and the abundance of the beet leafhopper and associated insects. CULTURAL HISTORY OF THE AREA The Snake River Plains, in which the Twin Falls beet-growing dis- trict is situated, are located in the northern desert shrub region. The sagebrush (Artemisia tridentata Nutt.) association originally formed the vegetative cover. Extensive areas of this perennial cover have been cleared to prepare the land for cultivation, and, while most of it is continuously farmed, thousands of acres, particularly the borderlands and those sections having an inadequate water sup- ply, are farmed intermittently or have been abandoned. Piemeisel (9) states that these denuded tracts, now in the early stages of reverting to the original vegetation, are covered with weeds, chiefly five annuals—tumblemustard (Norta altissima (L.) Britton), flixweed (Sophia parviflora (Lam.) Standl.), green tansymustard or sage mustard (Sophia longipedicellata (Fourn.) Howell), Russian- thistle (Salsola pesiijer A. Neis.), and downy bromegrass or downy chess (Bromus tectorum L.). Of these, the first four are of particular importance in that they are the first to occupy denuded lands after abandonment and are of special economic importance on such areas because they serve as favorable hosts for the beet leafhopper. The seasonal sequence of these weed hosts from green tansymustard late in the winter and in the early part of spring to Russian-thistle during the summer and fall affords, under optimum conditions, an unbroken series of favorable food plants for the development of large populations of the beet leafhopper. A discussion of this seasonal sequence and its relationship to the beet leafhopper is given in a later section (p. 7). Downy chess, an introduced annual, which appears somewhat later on the denuded lands, is not regarded as a host of the beet leafhopper and will be discussed in that connection. Carter (2) and Annand and others (1) have emphasized the relation of the large abandoned areas adjacent to the Twin Falls beet-growing district to the abundance of the beet leafhopper and the curly top disease. Extensive surveys throughout southern Idaho by Haegele (6) gave additional information as to the importance of these weeds as hosts of the beet leafhopper. The flight and movements of the leaf- hopper from one host to another and from one area to another have been discussed somewhat in detail by Carter (2), Haegele (6), Annand and others (Í ), and Fulton and Chamberlin (4). It has been pointed out in these papers that these weed hosts, especially the rapidly grow- ing spring mustards, are of prime importance in producing large early-spring populations of leaf hoppers. 3 Italic numbers in parentheses refer to Literature Cited, p. 43. BEET LEAEHOPPER 01!^ SECONDARY PLANT SUCCESSIONS HISTORY OF THE PLOTS An investigation of the succession of important predominating insect species was paralleled with a similar study of the succession of plant cover on denuded or newly abandoned lands. This phase of the inves- tigation was carried out as an independent study by Piemeisel ^ of the Bureau of Plant Industry, who with Lawson (10) has completed a study of vegetation in its relation to the beet leafhopper in California. The plots upon which this study was made were located near Hol- lister, Idaho, near the center of an important breeding area of the beet leafhopper. Six small plots, each comprising 100 square meters, were fenced and protected from the grazing of larger animals. Obser- vations on plant growth and condition had been made early in 1928, but it was not until the last of May that the plots were enclosed and in June that routine insect collections were begun. All of the plots were situated in fields that had been last irrigated and cropped in 1927. Each plot represented a particular phase in abandonment at the beginning, but only plots 1, 4, and 5 are con- sidered in any detail in this discussion, and a chronological history of these three plots is given for the period beginning in 1927 and ended in 1933 (table 1). TABLE 1 .—Plant composition of plots 1,4, and 5, and percentage of the area covered by each species during the years 1927 to 1983, inclusive, Hollister, Idaho (PiemeiseVs data) Propor- Propor- Plot and tion of Plot and year Type of stand Type of stand tion of area year area occupied occupied Plot 1: Percent 1927. Percent Irrigated alfalfa crop.. {Flixweed 42 (Alfalfa 1931. Downy chess and flixweed.^ 37 Downy chess 17 1928_ <Bare area Nearly bare [Downy chess. 4 [Downy chess- 99 (Alfalfa INearly bare... 1929_ ■(Bare area 1 [Downy chess. {Downy chess 98 1933.- Nearly bare or sparse downy (Alfalfa 0) chess 1930_ •^ Bare area 0) 2 [Downy chess- 0) Plot 5: 1927.. Irrigated alfalfa crop.. (Alfalfa 1931_ <Barearea (Alfalfa [Downy chess. 1928._ 9 IRussian-thistle. 91 (Alfalfa (Alfalfa -^ Bare area {') j Flixweed [Downy chess.. 90 [Downy chess.. 2 (Alfalfa (}) (Alfalfa 10 <Nearly bare... < Flixweed [Downy chess. 85 Plot 4: [Downy chess.. 5 1927- Irrigated crop of barley [Alfalfa 7 I Flixweed 10 (Russian-thistle and barley I Downy chess.. 1928.. stubble [Nearly bare... Russian-thistle (pure stand). (Alfalfa 3 ("Russian-thistle and flixweed. <Downy chess.. \Downy chess 92 [Nearly bare. _. 5 {Flixweed (Alfalfa 1930. Tumble mustard. 1933. <Downy chess. (2) Downy chess [Bare 1 No record. 2 Less than 1 percent. ABLE'CÏSS' WnpublXd mïïulSptY"''' '°™'' '"' ''^'^"° ^^'^^i^nvsn LANDS AND THEIK PROB- 4 TECHNICAL BULLETIN 6 0 7, U.
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